Machine tool transmission and control



Oct. 10, 1950 H; SCHOEPE 2,525,423

I MACHINE TOOL 'mmsmssxou AND CONTROL Filed July 1'1, 194'! e Sheets-Sheet 1 I N VEN TOR.

I-I115] EEHEIEPE 31% F'l-r-rugmzys H. SCHOEPE MACHINE TOOL TRANSMISSION AND CONTROL Oct. 10, 1950 e Sheds-Sheet 2 Filed July 17, 1947 INVENTOR. HFIR'R'Y SEHDEPE #41), 74W, g'mw HTTURNE s Oct. 10, 1950 H. SCHOEPE MACHINE TOOL TRANSMISSION AND CONTROL 6 Sheets-Sheet 3 Filed July 17, 1947 INIfENTOR.

Hw M m I Oct. 10, 1950 H. SCHOEPE 2,525,428

MACHINE TOOL TRANSMISSION AND CONTROL Filed July 17, 1947 e Sheets-Sheet 4 INVENTOR. I'IFIR'R) SEHEIEPE BY W, Z WH WLWWQ'WQ HTTDRNE s Oct. 10, 1950 H. SCHOEPE v MACHINE TOOL TRANSMISSION AND CONTROL 6 Sheets-Sheet 5 Filed July 17, 1947 E155 EDHDEF-E- BY w aumw FITTDRNE' s H. SCHOEPE MACHINE TOOL TRANSMISSION AND CONTROL Oct. 10, 1950 6 Sheets-Sheet 6 Filed July 17, 1947 R m m m m w w 5 1 R w t W R H 0% w rlmlil. WW, m DU 1 Patented Oct. 10, 1950 2,525,428 FFICE MAGHINE T QL T NSMl S O D CQN'IRQL Harry Schoepe; Cleveland, Ohio, assig'nor to The Warner 8: Swas'ey Company, Cleveland, Ohio, a

corporation of'Ohio Ap l n Ju y 12 1941,. ea

Th s invention rela sitb a machine 99 nd particularly to the change'speed'transmission for driving a movable part ofthe machine tool,-

such as the work spindle, and to the controls for said transmission, n

An object of the invention is to provide in a change speed transmission for a movable part of a machine tool having shiftable elements, improved and novel means for facilitating the shifting of said elements without clashing or injury thereto.

Another object of the invention is to provide in the, transmission for a movable part of a machine tool having shiftable change speed elements, improved and novel means for shifting said elements and wherein a slow non working drive is imparted'to said transmission and movable part immediately upon' the discontinuance of the working drive thereto while a predeter- "mined time delay proportional to said former working speedis interposed between th initiation of the slow vnon-workingdrive and the shifting of the elements, wherefore shifting of-the element's does not occur vuntil the velocity of the- 1 transmission and movable part has been reduced from said former .wo'rking'speed to the slow nonworking drive.

A further object is to provide a machine tool transmission for driving a movable partat a plurality of difierent speed ranges each of which includes a plurality of different speeds andwhich transmission includes shiftable elements and me s r m r i ge nw rki dr v to the transmission and movable part preparatory to shifting said elements and wherein said slow drive is initiated upondiscontinuance of the working drive while-a time delay is interposed between the initiation of the slow driveand the actual shiftingfof the elements that is proportioned to the speed. range at which the transmis-.

sion and movable part were operating, wherefore greater time delay occurs before shifting the 12 Ciairns. (o1. reg-.33)

2. transmission in the headstock for driving the work spindle. I

Fig. 3 is a detached diagrammatic view of the mechanism for shifting the three-step gear co e which provides the plurality of speed ranges for the transmission and movable part and shows diagrammatically a portion of the hydraulic control circuit for said mechanism.

Fig. 3a is a fragmentary detail partly sectional View showing the pivotalconnection ior the end of theroclzable shifting arm for the three step gear cone.

Fig. 3b is to be viewed in conjunction with Fig. 3 and illustrates certain of theicontrolvalves and the remainder of the hydraulic control circuit. i

' Fig. .l is a sectional view taken on line 4 -4 of Fig. 3b and is located within said Fig. 3b.

Fig. 5 (Sheet v1) is a detached fragmentary detail longitudinal sectional view of a. portion of'the time delayunit'employed in conjunction with the time delay valve;

' F g. .6' (S et 1), is a detached sectional view taken on line B- 6 pfjm 5 "Fig. '7 (Sheet 4) is a fragmentary front elevational view of the headstock'and showing in is ction the time delay valvemounted in the upper portion of the headstock. 3

Fig.3 is asectional view taken on line 8--B 'ofF igQ'Z looking'in the direction of the arrows.

Fig. 9.is a sectional view taken on line 9-9 of Fig. 8 looking in the'directionof the arrows.

Fig. 10 (Sheet 5) is a view, partly in plan and partly in section, of the speed selector valve.

looking .in the direction of the arrows.

elements when the transmission and movable Further and-additional objects and advantages not hereinbefore specified will become apparent hereinafter during the detailed description of an embodiment of the invention'which is to follow. I I

Referring to the accompanying drawingsillus- :21

'trating said embodiment I Fig. 1 is -a front elevational view of a turret lathe to the headstock'transniission of which the invention is applied.

. Fig.2 is a developedview of the change'speed Fig. 11a is a developed view of the circumferencepf the speed selector valve body approximately at the location of line Ha-l la of Ffig. 10 and indicating the portstructure shown in Fig. 11. g I

Fig; l2 is a sectional view taken substanially on line 12712 of Fig. 10 looking in the direction ofthe arrows.

Fig. 12d'is a developed view of the circumference' of the speed selector valve body approximately at the location of lindlZa-l'ZcQf Fig. l0 and showing the port structures indicated in Fig.1?

s-1. a 1. are se tidn iew ken. respectiv 15 on lines l 3 l3 and M -l4 of Fig. 10' .looki in the direction of the arrows.

. l (Sheet 4) is a sectional view "taken .substantialiy on line 15-15 .of Fig. 3 (Sheet 2 loohingin the directionoi the arrows, and

Fig? 15a" (Sheet '1) is a fragmentaryfpartly 1 sectional andlpartly elevational view taken along in the direction of the'arrows; and

Fig. .11. is a sectional view through thespeed l selector valve, taken on line ll-H of FigmlO Figs. 16, 1'7 and 18 (Sheet 6) are fragmentary plan views of the headstock similar' t'o Fig. .3 and with portions in section and illustrate the three different positions of the parts for the three different speed ranges of the transmission and work spindle, namely, Fig. 16 shows the parts in position for the slow speed range; Fig. 17 shows I the parts in position for the medium speed range and Fig. 18 shows the parts in position forthe fast speed range.

The present invention constitutes an improvement on the construction disclosed and described in the copending application of Crysanth M. Mirossay, Serial No. 752,353, filed June 4, 1947, now Patent No. 2,501,286, dated March 21, 1950, and to which reference may be made herein in respect to certain details of structure which per se form no part of the present invention.

In Fig. 1 there is shown a turret lathe comprising a bed 39 at one end of which is locat'ed the headstock 3|. A work spindle 32 is rotatably mounted in the headstock to be driven by a change speed gearing transmission at a plurality ofdiiferent speed ranges, each of which ranges includes a pluralit of different speeds.

Referring to Fig. 2 wherein the change speed gearing transmission is illustrated in a developed way, it will be seen that a power source, in this instance a suitably driven pulley 33 is secured to. the mainxdrive shaft 34. A fluid pressure operated friction clutch is mounted on the shaft 34 and comprises a sleeve-like clutch member 35 keyed to the shaft and carrying in a well-known manner a series of clutch plates 35. The member 35 has fixed thereto a housing 31 in which is movably mounted a clutch actuator or piston .38. A stationary ring 39 surrounds a portion-of the sleeve 35 and said ring, is provided with an annular groove 49 which i s-always injcommunication with an opening 4| in the sleeve. A suitable supply conduit, later to be referred to, is connected to the stationary ring 39 and is in com munication with the annular groove 40. The opening 4| in the sleeve 35 communicates with an axially extending duct 42 formed in the shaft 34 and said duct in turn communicates with a second opening 43 in the sleeve 35 which, in turn, communicates with the interior of the housing 31, wherefore the actuator or piston 38 can be sub- "jected to pressure fluid to move the same in a clutch engaging direction. A clutch element,

is freely rotatable on the shaft 34 and is proelement that is splined on the spline shaft 53 rotatably mounted in the headstock.

In Fig. 2 the gear 52 is shown as in mesh with the gear 50. The spline shaft 53 also has splined thereto a second shiftable two-step gear cone or element formed of the gears 54 and 55 adapted to mesh, respectively, with gears 56 or 51 fixed to a countershaft 58 rotatably mounted in the. headstock. In Fig. 2the gears 54 and 56 are indicated as intermeshed.

From the foregoing it will be seen that four different speeds can be imparted to the counter shaft 58. This countershaft 58 has fixed thereto an elongated pinion gear 59. The pinion 59 is shown in Fig. 2 as in mesh with the large gear 60 of an endwise shiftable three-step gear cone or element that is. freely rotatable on a stationary shaft 6| mounted in the headstock. This three-step gear cone further includes the small gear '62 which is adapted tomesh with a large gear 63 fixed on the work spindle 32. This is the condition illustrated in Fig. 2 and it will be noted that since the drive to the work spindle from the shaft 58 is by means of a compound reduction through small gear 59, large gear 60, small gear 62 and large gear 53 then thespindle will be driven atits lowest speed range.

When the three-step gear cone on the stationary shaft 5! is shifted toward the left to bring the large gear 50 while still in mesh with the pinion 59 into mesh with a small gear 64 fixed on the work spindle 32, the small gear 62 will then be out of mesh with the large gear 63 and the large gear 55 will act as an idler between said pinion gear 59 and the gear 64. When this con-.

includes a gear 65 smaller than the gear 65 but 1i :larger than the gear 52'and which when the gear cone is shifted to its most left hand position, intermeshes with the gear 5'1 on theshaft 58 and larger than the pinion gear 59. At' this time the large gear 65 of the three-step gear cone is out'of mesh with the'pinion gear 59 and gear 54 and has been intermeshed with a gear 66 fixed on thework spindle 32 and hence the work spindle will be driven with a compound step-up from the shaft'58 through relative large gear 51, smallgear '65, large gear 59 and smaller-gear t5 and at the fast or upper speed range.

From the foregoing description" it will'be observed that the' work spindle 32 can be driven in vided with an enlarged housing portion embr'acing the left hand end of the sleeve 35 andwhich internally carries a series of clutch plates 45'inr terposed between the plates 39 carried bysaid sleeve-like clutch member 35.

It will be understood that when the piston 38 "is moved by the pressure fluid toward the left the clutch plates 36 and 45 will be pressed together or engaged and hence the clutch element 44 will be driven by the shaft 34 through the any one of three different speed ranges depending upon the position offthe three-step gear cone on -the shaft GI and said ranges" are designated herein asthe high, medium'and low speed ranges. It will further be noted that in each speed range the work spindlemay be driven at, four different speeds depending upon the positions of the two two-step gear cones on the spline shaft 53. Hence the work spindle has a total number of twelve different working speeds. i V

The two-step gear cone on the spline shaft 53 and formed of the gears 5| and 52 may be shifted to either one ofits two' operative positions by means of a fork straddling the gear cone and carried by a hub portion 6'! of the fork which is fixed toa piston rod 58 s'lidable in the headstock, see'Fig. 3 (Sheet 2). The two-step gear cone on the splin'ezshaft 53 and :formed of'lthe gears 54 and 55 is shifted to its two-operative positions :by meansof a fork'straddling the gear 55 and formed on a hub portion 69 that is fixed to a' piston rod 19 slidably mounted in the headstock. -Ihe forks which shift these two'two-step gear on s except the h bs 6 an 6 t e flu d pressure motors which actuate the piston rods 68 and I and the passages to said motors from the speed selector valve later to be referred to have not been shown herein since they are fully dis: closed in said copending application of Crysanth M. Mirossay, Serial No. 752,353- and'per se form no part. of e p es n nven io T e three-s ep s e cone on the sha BI and formed of the gears iii}, 62 and 65 is shifted to its three p rativ p sitions y means o a p voted shoe fitting the groove H (see Fig. ,3) in the three-step gear cone and carried by the end of a rockable rm 2 t e posi end of wh h is in the form of a fork 13 (see. Fig. 341) having fiat surfaces straddling a fiat surface portion 14 of a vertically extending pin 15 that is rockably supported in the headstock cover (see Fig. 15, Sheet 4). It will be seen that rocking of the arm or lever 12 will rock the pin I but at the same time the arm can have limited and relative endwise'movement withrespect thereto. The

lever or arm l2 intermediate its ends is pivotally connected as indicated at 16 to a piston rod 1'! slidably mounted in the headstock. The rockable pin 775 has connected to it to rock therewith a valve body it located within a fixed valve hous- 1 73 carried b T 1 1? headstock cover. This valve may be designated as the speed range controlled valve and the ports and passages thereof will be described in detail hereinafter.

As fully described in said copending application Serial No. 752,353, the piston rods 68, H1 and 11 are extended from three pressure fluid motors, only one of which need be indicated in detail herein, namely the motor 80 which mounts the piston SI for moving the piston rod 11 to effect the shifting-of the'three-step gear cone. The operation of the three'pressure fiuid motors just referred to is controlled by a speed selector valve 82 mounted on the headstock cover, see Figs. 3 (Sheet 3) and Ill) to 14 inclusive (Sheet 5) The speed selector valve 82 comprises a valve body 83 (Fig. rotatable in the valve housing, the said housing and body containing port and passage arrangements later to be explained in further detail. The valve body 83 has a shaft 84 extending outwardly of the valve housing and coupled to a shaft 85 rotatably. carried by the upper part of the headstock and extending beyond the front thereof where it is provided with a hand wheel 85, see Fig. i. It will thus be seen that rotation of the hand wheel 86 will cause rotation of the valve body 83} of the speed selector valve.

tially spaced detent notches corresponding to the twelve speeds'of the'work spindle (see Fig. 10, Sheet 5, and Fig. 15., Sheet ,4). A roller carried at the lower end of 'a-pivoted arm 8% cooperates with said detent notches at all times since said arm is urged towardtl' e circumference of the disk by a spring pressed plunger 89. Thus the valve body of the speed selector valve will be held in any one of its twelve selected speed positions.

The shaft 85 is operatively connected adjacent its forward end to the shaft of an indicator 9!) carried by the headstock and showing spindle speeds in relation to cutting speeds in feet per minute for different diameters of work and correlated to the selected speed positions of the speed selector valve body 83.

ln order to impart to the transmission a slow non-working speed preparatory to shifting the gear cones to change the speed of the work'spin dle the following arrangement is provided (see Fig. 2, Sheet 1). A shaft 9! is rotatably mounted in the headstock and extends transversely of the shaft W and has fixed to one of its ends a bevel gear 92 which mesheswitha bevel gear 93 fixed to the main drive shaft 34, The shaft 9| has fixed thereto a worm 96 which meshes with a worm wheel 95 (see Fig. 3b, Sheet 3) that is freely rotatable on the shaft ll intermediate a collar 36 fixed to said shaft ll and a housing or cylinder 91 which also is fixed to the shaft 41 to rotate therewith and is mounted within a sta-' tionary ring 93 carried internally of the headstock. The worm wheel 95 on its side adjacent to the cylinder 91 and within the open end of said cylinder is provided with friction clutch plate material 99. A piston Hill is splined on'the shaft 37 and is slidable within the cylinder and is provided on its face adjacent to the worm wheel $5 with friction plate material lfi'l, wherefore it will be seen that when the piston lilfi -is.moved by fiuid pressure toward the left as viewed in Fig. 3b, the friction plates 99 and liil will be engaged and hence the worm wheel; 95 will act to rotate said piston iiiii and shaft d? to drive the transmission at a slow non-working speed.

The stationary ring so is provided in its in ternal circumference with a circular groove I02 which is always in communication with a port lilii formed inthe cylinder 91. The groove H22 in the stationary ring is also in communication with a port le t which, as will later be explained, is connected to a pressure fluid supply pipe.

In addition to the speed selector valve 82 and the speedrange controlled valve 19, a main 'c'ontrolvalve including the gear shifting cycle valve, and a time delay valve are employed in the hydraulic control circuit (see Figs. 3b, 7 and 8). The maincontrol valve is carried by a plate Hi6 that is bolted or otherwise secured to the front of the headstock, with the housing of the main control valve H35 extendingv through an opening in the front wall of the headstock. The main control valve N35 is provided with a valve chamber in which is rockably mounted a valve body. It? controlling the main drive clutch and which body in turn is provided with a valve c amber in which is slidably mounted a gear shif ing cycle control valve body I08. The rockable main drive clutch control valve body I8? is provided with a hub-like portion I09 that extends outwardly of the valve housing through and beyond an opening in the plate Hi6 and is rockably supported in said opening. The slidable gear shifting cycle control valve body M38 is pro vided with an extension! ill which passes through the hub portion H33 and extends beyondthe outer end of the same.

Keyed t the reduced outer end of thev hub portion I88 of the rockable valve body it? is a handle bracket i ll which has two downwardly extending spaced leg portions each provided with a forwardly extending lug I i2 (see Figs. 8 and 9, Sheet {1). The bracket ill is provided on its upper side with an upwardly extending lug H3.

A stop plate M is bolted or otherwise secured to the front" side of the plate I06 and is provided sews tending lugs II2'of the bracket III, wherefore said handle body can be rocked inwardly and outwardly relative'to the front face of the plate I. The handle body H6 carries at its upper end a handle I I1 and said handle and said handle body hereinafter will be referred to conjointly as the handle. The handle above its pivot is provided with an abutment pin I I8 which is aligned with the extension I I0 of the slidable gear shifting cycle control valve body I08 when the handle is in its normal position I, indicated by full lines in Fig. 8. When the handle is rocked inwardly from its normal position I to position II, that is, to the position shown in Fig. 3b, the abutment pin II8 acts on the extension IIO to shift the .slidable valve body I08 from its most left hand position shown in Fig. 8 to its most right hand position shown in Fig. 3b. It will later be pointed out that the pressure fluid acts automatically on said slidable valve body I08 at the end of the :gear shifting cycle to move said body outwardly or toward the left and thus restore the handle from position II to its normal position I.

It will be noted that the handle III can be rocked laterally from forward to neutral position, i. e., positions F and N or vice versa, to rock the rockable valve body I01 of the main drive clutch control valve. A spring point II9 carried by the reduced hub portion of the rockable valve body I01 cooperates with spaced notches in the extension I I0 of the slidable cycle valve body I08 to hold said valve body in its two endwise shifted positions corresponding to handle positions I and II. The handle bracket III is provided with a spring-pressed ball detent I20 which cooperates with two recesses formed in the plate I06 (see Fig. 7) to hold the handle II! in either one of its two laterally rocked positions, i. e., position F or position N.

The upper part of the headstock mounts a time delay valve I2l, the housing of which is provided with a valve chamber slidably mounting a valve body I22 and also having at the left hand end of the chamber a time delay unit I23. The time delay unit I23 is inserted into the housing of the time delay valve I2I from said left hand end thereof and comprises a cup-like member containing a series of bafiie disks I24 carried on a rod extending therethrough and with said disks having peripheral notches staggered with respect to each other (see Figs. and 6) and providing tortuous paths through the device for the pressure fluid, wherefore it will take a predetermined time period for the pressure fluid to flow through the unit and into the chamber of the time delay valve. The details of the main control valve, the gear shifting cycle control valve, the time delay valve, the speed selector valve and the speed range control valve will be described in connection with the hydraulic circuit now to be explained.

Referring to Fig. 3b, the hydraulic circuit includes a pump I25, the input side of which is connected by a pipe I26 with a diagrammatically shown sump or reservoir I21 which may be actually the lower portion of the headstock casting.

The output side of the pump I25 is connected or groove is shown on the rear side of the headstock wall. The groove I30 is connected by an inlet groove I3I with the valve chamber of the main drive clutch control valve I05. The" groove I30 is also connected to a pipe I32 which extends to the time delay valve I2I and is the inlet pipe for said valve. The groove I30 is connected by a pipe I33 to the inlet of the speed range control valve"!!! (see Fig. 3). The pipe I33 communicates with a bore I34 formed centrally of the rockable valve body I8 of the speed range control valve. The body I8 is provided with a radial passage I35 extending from the bore I34 to the periphery of the valve body and always communicating with one or theother of three ports I36, I31 and I38. The valve body I8 is provided in its periphery with exhaust recesses I39 and I so arranged as to be in communication with the two of the ports I36, I31 and I38 which are currently not connected with the radial passageway. I35. The recesses I39 and I40 are connected by drilled holes I I-I and I42 with a drilled chordal-like'passage I43 dead-ended at one end and having its other end terminating in v a circumferentially extending recess I44 which always communicates with the exhaust or drain passage I45 formed in the valve housing I9. Hence two of the three ports I36, I31 and I38 will always be connected to exhaust.

The ports I36, I3I and I38 are connected by pipes I46, I47 and I48, respectively, to ports I49, I50 and I5I formed in the housing of the time delay valve I2I and communicating with the valve chamber. It will be noted that the valve chamber of the time delay valve has four bores of different diameter, namely, one in which the main portion of the valve body slides while the other three bores slidably receive reduced portions of the valve body indicated as portions I52, I53 and I54, said portions decreasing in diameter in the, order named with the right hand ends of such portions being pistons of different projected areas against which the pressure fluid from one or another of the ports I49, I50 and I5I act depending upon which ofthe pipes I46, I01 andI IB are connected to the inlet side of the speed range controlled valve I9. Since one of the conduits I46, I47 and I48 is always connected to the inlet side of the valve .19 there will always be pressure fluid acting on the slidable :body I22 of the time delay valve tending to restore and maintain said valve in its most left hand or normal position. Therefore it will be seen that-in order to move the valve bod I 22. from its normal position toward the right and intov the position shown' in Fig. 3b differentfluid pressures will be required depending upon which reduced piston portion at the right hand end of, the valve body is being acted on by the pressure fluid to oppose the movement of the valve body from its normal position and to the right. In other words, if pressure fluid is acting on the largest reduced portion I52 it will require the build up of greater pressure on the left hand end of the valve body to move the latter toward the right than it would if the pressure fluid was actingon the intermediate portion I53 or the smallest portion I54. Hence different time delay periods are produced before the valve body I22 moves toward the right after the cycle valve body I08 has been moved to its .most. right hand position. p .The inlet groove I3I to the main control valve r g. 1 e gi F e a v o ma i shifted.

7 I64 communicates with the drain-recess I23 of the time delay valve. Hence when this condition occurs pressure fluid will be flowing to the time delay unit I23 and will pass through said unit with a predetermined time delay and into the valve chamber of the time delay valve to the left of the valve body I22 to build up pressure sufficient to overcome the resistance of the pressure fluid on one or the other of the piston portions I52, I53 and I54 before shifting the valve body I22 from its normal left hand position into its right hand position as indicated in Fig. 3b. Hence it will be apparent that three difierent periods of time delays will occur be tween the shifting of the cycle valve body I08 to its right'hand position and the shifting of the valve body I22 of the time delay valve to its right hand position. Immediately upon shifting of the cycle valve body I08 to its right hand position pressure fluid flows through the groove I51, groove I58 and pipe Iiiilto the port I05 in the stationary ring 98 and thence into the cylinder 91 toshift the piston I00 into clutch engaging position with the worm wheel 95.

Assuming that the transmission and work spindle are coasting subsequent to disengagement of the main drive clutch, slippage will occur between the iriction plates 99 and IOI until the velocit of thetransmission and work spindle has come down to the slow non-working speed, at which time the friction drive takes effect and the transmission commences to rotate at the slow non-working speed. When the machine is idle and the transmission is not rotating at the time the piston I00 is clutched to the worm wheel 95, then the initiation of the slow nonworking drive takes place immediately.

The main drive clutch on the shaft 34 is connected by a pipe IfiI with a groove I62 and in I turn by a further groove I83 which extends. to

a port I04 formed in the housin I05 of the main control valve. The port I54 communicates with a drainrecess I tdwhen the rockable valve body I01 has be'enrocked to neutral position. When said rockable valve body has been rocked to forward position then a diametrically extending passage I06 in said body communicates with the port I60 and with the valve chamber in It will be sage I80 will be' connected with port I64 and pressure fluid flows to the main drive clutch'to engage the same. Conversely, if the valve body I01 is rocked to'neutral position then the port I85 while the passage I communicates with a drain port I68 in the valve housing I 05 andat such time the main drive clutch is disengaged. It will be noted, however, that even. though the rock able valve body I01 has been, rocked to'forward position to effect engagement of the-main drive clutch the instant the cycle valve body I08 is shifted to its right hand position (as indicated in Fig. 3b) by movement of the lever I I1 from position I tov position II then the land I81 breaks communication between the inlet port I and the passage. I08. and hence the flow of pressure fluid to the main drive clutch is terminated. and said drive clutch is disengaged, the pressure fluid in the linesto the main drive clutch being new free to drain between the land I61 and the wide land'lii of the valve body I08 and throughthe passage I86 and port IiiSa which is displaced from the port I03, it being understood that a suitable longitudinally extending groove connects the passage I68 with a circumferential groove in the valve and which is in communication with the port 3811.

The valve body I01 is provided with a di ametral passage I10 which in either'rocked position of the valve body is in communication with a drain passage I1I in the housing I05 and with a pipe I12 which extends 'to a port I13 in the housing of the time delay valve I2I and which port communicates with the valve chamber at the right hand end of the time delay unit I23. It will be seen that when the cycle control valve I08'is in'its normal position as indicated in Fig. 8 the passage I 10 in the valve body I01 communicates with the valve chamber between the wide land I 69 and the right hand narrow land I14, wherefore the port I13 and pipe I12will be in communication with the drain passage I'II irrespective of the rocked position of the valve body I01, thus permitting the time delay valve body I22 to be restored by the pressure on one of the three piston portions at its right hand end. Conversely, when the cycle control valve body I08 is moved to its right hand position as indicated in Fig. 3b the wide land I69 closesthe passage I10 and hence at. this time pipe I12 and the valve chamber intermediate the time delay unit I23 and the left hand end of the time, delay valve body I 22 is not'connected to drain.

V The right hand end of the valve chamber in .the rockable valve body I01 is connected to a groove I15 which extends to a groove I16 to which a pipe I11 is connected and said pipe extends to and isconnected with a radialpassage I18 in the housing of the time delay valveand which radial passage connects with an annular groove I19 in the internal circumference of the valve-chamber, It will be noted that when the time delay valve body I22 is in its right hand position as shown inFig. 31) that its wide land I80 interrupts passage I8I in the-valve housing and which extends to drain but when the valve body I22 is in its normal left hand position as shown in Fig. '1 then the drain passage I8I is unblocked and. at such time pressure fluid in the radial passage I18 and the annular groove I19 is free to flow through the valve chamber and Therefore at this time if the valve body I01 is rocked to forward position said pas the drain passage IBI to drain for a purpose later to be explained. I v

I Thevalve bod I22 of the time delay valve is provided with a port I82 which communicates with the valve chamber and is shown in the normal position of the valve bodyas indicated in Fig. 7 as closed by the wide land I but in the right hand positionof the valve body as indicated in Fig. 3b as uncovered and located be- I 11 The passage I86 when the valve body is in its right hand position is intermediate the lands I80 and I83 and hence in communication with the The radial port 203 in this position of the valve communicates with a drilled opening and groove valve chamber,'it being noted that said passage I86 is so disposed relative to the port I82 that duringthe movement of the valve body toward the right pressure fluid will first flow through said port I82 and pipe I84 and shortly thereafter will flow from the valve chamber through the passage I86 and apipe l8! that extends to a drilled opening or passage I88 in the supporting plate I89 for the speed selector valve 82. v

The speed selector valve82 is mounted on the plate I89 which overlies the three pressure fluid motors that actuat'ethe piston rods I9, 68 and Hand hence the valve housing, said plate and the housings of thefluid pressure motors can be provided with grooved passages, drilled openlugs and the like forming short conduits for the pressure fluid and without requiring the use of, piping for such purpose, all as clearly shown. and described in said copending application Serial No. 752,353. I

The rotatable bod 83 of the speed selector. valve is provided with a bore I99 that extends part way through the body from the rear end thereof and is in' communication with the port I85. The valve body is provided throughout its length with a plurality of circularly spaced radial ports connecting with the bore I90 and with a plurality of cylindrical recesses or grooves having axially extending branch grooves in the periphery of the valve body, all as fully described. in said copending application Serial No. 752,353. It will be understood that the valve body has twelve different operative positions since there are twelve operative speeds for'the spindle. It will not be necessary herein to describe the ports, grooves and passages which connect the valve with the motors for the piston rods 68 and Ill that shift the two two-step gear cones since this is clearly shown and described in said copendingv application Serial No. 752,353. and per se forms no part of theinstant invention.

1 Referring to Figs. 10, 11 and 11a it will be seen that the portion of the valve includedin the proximity of the lines IIa I I a and II I l' con,-v t ainsv eight radial ports and four lateral extensions from a circular groove I 9| that overlies anop'ening and groove I92 in the valve housing and which communicates with ardri lled opening. I93 that leads to the sump. The lateral extension I 94 of the four extensions communicates in the valve body position shown with a drilled: openingand groove I95 in the valve housing and extending to the drilled opening I96 in the housing of the pressure fluid motor 80 and which latter opening communicates with the right hand end of the 'narrow portion of thecylinder of groove I 98 in the valve housing and the latter' in turnwith the drilled opening I99 in the'hous ing of the motor 80 and extending to the left hand end of the large portion of the cylinder of said motor. I r

' Referring to Figs. 10, 12 and 12a it will be seen that the portion of the valve body adjacent the lines I2I2 and I2a-I2a is provided with four radial ports and eight lateral extensions from the annular groove 200. The annular groove 200 overlies a drilled opening and groove 20! in the valvehousing which extends to an opening 292 in the casting and communicating with the sump- 294 in the ,valve housing and extending to the drilled opening 205 in the housing of the motor 89 which communicates with the end of the smaller bore portion of the cylinder that is immediately adjacent the large bore portion thereof.

Referring to Figs. 10, 13 and 14 it will be seen that the periphery of the valve body 83 adjacent the lines I3I3 and I 4-44 is provided with a flat 206 extending axially of the body and forming with the wall of the valve chamber an axially extending passageway which when the body is turned and the flat overlies the drilled openings and grooves 281 and 298 will bridge said openings and place the same in communicationwith each other. The drilled opening and groove 29? communicates with a drilled opening 299 in the housing offthe motor 80 which communicates with a drilled opening 2I0 in the cylinder head 2H of the motor 88. The drilled opening and groove 208 communicates with a drilled opening 2I2 formed in the housing of the motor 89 and which communioates, in turn, with a drilled opening 213 in the cylinder head 2| I. The drilled opening 2|9 (see Fig. 15a, Sheet 1) communicates with a drilled opening 2I4 extending at right angles thereto and formed in the cylinder head 2| I and in the housing of the motor 89 and connected to the pipe 2I5. It will be noted that the openings 2I3 and 2M communicate with the bore for the piston rod I1, said openings being spaced 90 apart for a purpose later to be explained. The pipe I8! is connected to the opening I88 formed in the plate I89 and communicating with an open- 7 head to the bore for the piston rod I1 and is aligned with the opening 2 I 3.

The piston rod'Il of the three-position motor 88 is provided with longitudinally spaced L- shaped openings 2| 9 and 220 therethrough and intermediate said L shaped openings with a diametral opening 22 I. It will be seen that when the piston BI is in its most right hand position the L-shaped opening 2| 9 in the piston rod 1'! will register with the openings 258 and 2M (see Fig. 16, Sheet 6). When the piston 8| is in its intermediate position the diametral opening 22I will register with the openings M8 and 2I3 (see Fig. 17), while when the piston BI is in its most left hand position the L-shaped opening 229 will be in alignment withthe openings 2; and 2M (see Fig. 18).

The piston rod 1! of the motor has slidably mounted thereon within the motor cylinder a stop piston 222 in the form of a headed sleeve with the head sliding in the large bore portion of the cylinder.

Referring to Figs. 3 and 16, the piston is shown in its most right hand position and atthis time the arm I2 has been rocked toward the right and into the low speed range position. Assuming that it is desired to move the piston 8| to its intermediate position and that pressure fluid is flowing into the cylinder to the right of the piston 8! through the opening I96 and to the left of the stop piston 222 through the opening I99, it will be seen that the stop piston will be moved to the limit of its right hand movement, whilethe pist n Will be moved toward the leftuntil it engages the right hand and of the sleeve of the stop piston, whereupon further movement of the piston BI toward the left will be arrested due to the area differentials between the piston 8i andythe head of'the stop piston 222. This condition is clearly illustrated in Figpl'l and at this i. e., to the position when the three-step gear cone is set for the high speed range, then pressure'i-s admitted to the right of the piston SI through the opening I56 and is exhausted from the left of the stop piston 222 through the opening I99 and likewise is exhausted from the opening 285,

. whereupon the piston and the stop piston'move as a unit toward the left until they have reached the left hand limit of movement as indicated in Fig. 18. When it is desired to move the piston BI from its most left hand position to its intermediate position, pressure fluid .is admitted to the left of the stop piston 222 through the opening I99 and continues to be admitted through the opening I96 to the right of the piston I3I, whereupon due to the area differentials the stop piston moves toward the right together with the piston BI from the position shown in .Fig. 18 to the position shown in Fig. 17, it-being understood that at this time the piston BI is held against further right hand movement by the fluid pressure'entering the cylinder through the opening I96.

When it is desired to shift the piston BI from the intermediate position of Fig. 17 to its most right hand position of Fig. ldthen fluid isexe hausted through the opening I96 and is admitted through the opening 205, whereupon the piston 8! moves toward the right and away from the stop piston 222 until it is in its most right hand position.

It will be understood that the different operative positions of the piston ill just referred to moves the piston rod TI and the rockable arm 72 to three different positions corresponding to the high, intermediate. and low speed ranges. and such movement of the arm l2 rocks the speed range controlled valve bodyel' B. to place the passage I35 in communication with the ports I36, I37 or I38 and the pipes M5, I l'l and H58, respectively, to cause pressure fluid to flow to the time delay valve behind either the piston portion 552 or I53 or IE4 to provide the greatest, intermediate or least resistance tothe right hand movement of the time delay valve body to result in the longest. intermediate or shortest time delay between the initiation of the slow nonworking speed and theshif'ting of the three step gear cone. v e In order to coordinate and clarify the description hereinbefore given a resume of the oper- 'ation of the machine will now be set forth; As-

suming that the pulley 33 and shaft 3 1 are being power driven and that the pump I25 is operating so that the pressure fluid system can functionrand that a workpiece is mounted in the chuck of the work spindle while the control handle Ill is in positions I and N, that is, normal and neutral positions, at which time the main 'drive clutch is disengaged as is also the clutch for the slow non-workingdrive and the transmission is idle, then the operator turns the hand wheel 86 to set the speed'selector valve v82 for the desired spindle speed in relation to the diameter of the work in accordance with the cutting speed in feet per minute of the tool. It will be assumed that the spindle speed'selected corresponds to the setting of the valve 82 as shown in Figs. 3 and 10 to 14 inclusive, that is, to a speed wherein the three-step gear cone will be positioned for the low speed range. Inasmuch as the control handle is in positions I and N this setting of the speed selector valve 82 does not cause the gear cones to be shifted since said speed selector valve is receiving no pressure fluid at this time. As soon as the operator moves the control handle II'I inwardly from position I to position II the gear shifting cycle control valve body IE8 is shifted from its normal position to its most left hand position, i. e.,'from the position of Fig. 8 to the position of Fig. 3b and the spring. detent II9 will holdthe valve body I08 in its shifted position. The shifting of the valve body I08 initiates the gear shifting cycle since it causes the pressure fluid to flow from supply groove I3I into the groove I5! and thence through groove I58 and pipe I60 to the cylinder 91 to clutch the piston I00 to the worm wheel 95 which is currently driven from the main drive shaft, whereupon the shaft ll'I rotates at the slow non-working drive as do also all of the gears of the transmission and the work spindle. Simultaneously the pressure fluid flows from the groove I58 through pipe I59 and into the time delay unit I23. At this time the pipe I12 which communicates with the valve chamber of the time delay valve to the right of the time delay unit is deadened by the wide land 59 of the cycle valve body I08. Therefore the pressure flowing through the time delay unit 123 builds up to the left of the Valve body I22 of the time delay valve. The operation of the machine started at the beginning of a new work cycle and with the transmission and spindle at rest and hence not having high velocities which must be brought down to slow non-working speed.

It will be assumed that the last speed-in the previous work cycle at which the spindle had operated was in the high speed range so that the passage I35 of the speed range controlled valve body I8 was in communication with the port I 35 and the pipe I46 so that pressure fluid is flowing into the time delay valve to the right of the piston portion I52 through pipe I33, passage I35, port I36 and pipe I46. Therefore the movement of the valve towardthe right, due to the pressure fluid on its left hand end, is resisted by the pressure fluid acting on the largest piston portion I52, and consequently maximum time is required to build up suflicient pressure to move the valve body toward the right and into a position wherein pressure fluid will flow tothe speed selector valve 82 and to the fluid pressure motors to actuate the latter and effect the shift ing of the gears.

When the shifting'has been completed and the L-shaped passage 209 in the piston rod I? will register with the ports ZIS and 2M and pressure fluid will flowthrough the pipe U5 and into the annular groove H9 in the time delay valve, around the wide land 81; and thence outwardly' of the port I78 and through pipe Ill to groove I16 and thence through groove I15 to the right hand end of the cycle valve body I08, whereupon said valve body will be shifted automatically toward the leftto its normal position and the control lever II'I will be shifted to position I. At this time pressurefluid ceases to new intothe time delay unit I23 while the port I13 and pipe I12 are connected to drain, whereupon the pressure fluid acting on the smallest portion I54 of the time delay valve body moves said body from its right hand position to its normal left hand position, it being understood that the passage I of the speed range controlled valve I8 is now in communication with port I38 and pipe I48. At thi time the land I6! of the cycle control valve I08 is intermediate the ports I 55 and I56 so that port I55 is in communication with the passage I66 of the rockable valve body I01 and said passage communicates with drain. Therefore as soon as the operator swings the control lever II! from position N to position F passage I66 registers with port I64 and pressure fluid flows through groove I63, I62 and pipe I6I to the main drive clutch to engage said clutch, whereupon the transmission is operating at the selected working speed in the low speed range. It will be understood that the movement of the cycle control valve body I 08 toward the left to its normal position has disconnected the pressure fluid from the cylinder 91 to disengage the slow non-working drive to the transmission.

It will be noted that the time delay valve body having been moved to its normal left hand position, the wide land I BI! thereof is to the left of port I18, hence the pressure fluid flows from groove I19 to drain passage I8! and therefore fluid pressure on the right hand end of valve body I08 is relieved so this latter valve body can be moved inwardly again when desired. The machine is now operating at the selected speed in the slow speed range and hencepressure fluid continues to be exerted on the portion I 54 of the time delay valve body I22. During the operative step at this speed and in this range the operator can turn the handle 86 to set the speed selector valve 82 for the speed desired in the next operative step which will be assumed to be in the high speed range. As soon as the first operative step is completed the operator can move the handle II I while in position F inwardly from position I to position II to shift the cycle control valve body I 08 into the position shown in Fig. 3a. This results in disconnecting the pressure fluid to the main drive clutch and effecting the disengagement thereof and in connecting the pressure fluid to the cylinder 91 and to the time delay unit I23 and in blocking the drain from the delay valve through the pipe I I2.' It will be understood that since the transmission was operating in the low speed range during the first step that its velocity is relatively low and hence less time will be required for the velocity of the transmission and work spindle to be reduced from its working velocity to the velocity of the slow non-working speed preparatory to shifting the gears. Therefore since the pressure fluid is effective on the smallest portion I54 of the time delay valve body said body will beshifted from its normal position to its most right hand position in the minimum time period, since it takes less time to build up suflicient pressure on the left hand end of the valve body to overcome the resistance against its right hand movement caused by the smallest portion I54. Of course as soon as the time delay valve body I22 has shifted to its right hand position pressure fluid flows to the speed selector valve and the gears areshifted to obtain the selected speed for the second step.

The transmission is now operating in the high speed range. Assuming that the next operative step is in the intermediate range, then it will be shifting of the time delay valve body since the transmission and work spindle will have been operating with a high velocity requiring the greatest time period to reduce it to'the slowLnonworking speed velocity preparatory to shifting the gears. 7

Similarly, assuming that the fourth operative step is in the low speed range, then the shift from the intermediate speed range used in the third operative step to the low speed range will require an intermediate time delay in reducing the velocity of the transmission and work spindle from the intermediate speed range to the slow non-working speed and therefore the pressure fluid acting on the portion I53 of the time delay body will provide this intermediate time delay.

It will be seen from the foregoing that a time delay is interposed between the shifting of the cycle control valve body to initiate the-slow nonworking speed which is directly proportional to the speed range of the transmission and 'work spindle for the previous operative step. Hence, the time delay between the inward movement of the control handle from position I to position II and the actual shifting of the gear cones is directly proportional to the velocity of rotation of the transmission and work spindle. Therefore, it is always assured that the velocity of the transmission and work spindle will be reduced to the slow non-working speed velocity before the gear shifting occurs. This eliminates gear clashing, facilitates shifting, and protects the gear teeth, thus prolonging the life and accuracy of the gears.

Although a preferred embodiment of the invention has been illustrated and described herein it will be understood that the invention is susceptible of various modifications and adaptations within the scope of the appended claims.

Having thus described my invention, I claim:

1. In a machine tool having a movable part, a change speed transmission for moving said part at different operating speeds and including shiftable gears, a power drive for said transmission, means for rendering said drive effective or ineffective, means for selectively shifting said gears to obtain different operating speeds, and means for controlling said first means and said second means and including means for interposing automatically between the rendering of the power drive ineffective and the shifting of the gears different time delays each of which is proportional to a different one of the difierent operating speeds. V

2. In a machine tool having a movable part, a change speed transmission for moving said part at different operating speeds and including shiftable gears, a power drive forsaid transmission, means for rendering said drive eifective or ineffective, means for selectively shifting said gears to obtain difierent operating, speeds, and means for controlling said first means and said second means and including means acting durin each speed change for interposing automatically between the rendering of the power drive ineffective and the shifting of the gears a time delay which is proportional to the previous operating speed.

3. In a machine tool having a movable part, a change speed transmission for moving said part at different speeds and including shiftable gears, means for imparting working speed drive to said transmission, means for imparting a slow non-working drive to said transmission, means for selectively rendering said working speed drive and said slo w non-wo'rking speed drive effective or ineffective, means for selectively shifting said gears to obtain different speeds, and means for controlling the previously named means and including means for, causing automatically after the working speed drive has been rendered inef fective and the non-working speed drive rendered effectiveandprior to the shiftingof the gears different time delays each oflwhich is proportional to a different one of the different speeds.

4; In. a machine toolhaving a} movable part, a change speed transmission including "shift'able gears for moving said part at a plurality of different speed ranges with each range. including a plurality, of diiferentspeeds, a power drive for said transmission, means for rendering said'drive effective or ineffective, means for selectively shifting said gears to obtain different speed ranges and-different speeds in saideranges, and means for controlling saidfirstmeans and. said second means and including means for interposing automatically betweenthe rendering of the power drive ineffective and the shifting of the gears different time delayseach of which isproportional to a-different one of thevdifferent-speed ranges.

5. In a machine tool having a movablev part, a change: speed transmission including shiftable gears for moving said part at a plurality of different speed ranges each'including a plurality of parting a slow non-working speed drive to said transmissiommeans for selectively rendering said working speed drive and said zslow non-working speed drive effective or inefiective, means foriselectively shifting said gears to obtain different speed ranges and different speedsv in said ranges, and :means -for controlling the previously named means and includingmeans for-causing automatically after the :working speed'drive has been rendered ineffective and the non-working speed drive rendered effective and prior to the shift- .ing of the gears different time delays each of which is proportional to a different one of the different speed ranges.

6. In a machine tool having a movable part, a change speed transmission for moving said part at different operating speeds and including shiftable gears, a power drive for said transmission, means for rendering said drive effective or ineffective, means for selectively shifting said gears to obtain different operating speeds, and control means for said first means and said second means and including cycle control means actuated to initiate an automatic gear shifting cycle wherein said drive is rendered ineffective by said first means preparatory to the gear shifting by said second means, movable means for interposing automatically between such rendering of the power drive ineffective and the gear shifting different time delays each of which is proportional to a different one of the different operating speeds and after which said gears are shifted by said second means, and then automatically said cycle control means and movable time delay means are restored to their former positions.

7. In a machine tool having a movable part, a change speed transmission for moving said part at different speeds and including shiftable gears, certain of said gears acting to set up a plurality of different speed ranges for said transmission and part and other of said gears effecting variable speed operation thereof in each of said speed diiferentspeeds, means for imparting Working speed drive to said transmission, means for im- 18 ranges, a power drive for said transmission means for rendering said drive effective or iiieffective, means for selectively shifting" said gears to obtain a'desired' speed range and a desired speed of operation in said' range, ari'dla" control means for all of said means and including a time delay means for inter osing automaticallydif ferent time delays between the rendering of the drive ineffective and the shiftiifg'o'f tfiegears and which "time delays are each' proportional to a different one of the differentspeed ran es.

'8". In a :machi ne'tool having a movable part, a change'speed transmission ror'moving-said'part at different speeds and including smaame gears, certain of saidgears actingto set up a plurality of different speed ranges for said transmission and part and other of said gears effecting vari-' able speed operation thereof in each of said speed ranges, means for imparting workingspeed drive to said transmission, means for imparting a slow non-Working speed drive to said transmission, means fcr. selectively rendering said working. speed d'rive and said slow non-working speed drive-effective or ineffective, means for selectively shifting said gears to obtain a desired speedrange'and a'desired'spe'ed ofoperation in said range for said transmission and part, and control meansfor all of said means and including time delay means for interposing automatically. different time delays after said working speed drive has been rendered ineffective and said non workingw speed dr1ve renderedQefi'ectiVe and prior to the shifting of said gears and each of which" time delaysisdirectiy proportional to a' different one-of the different speed ranges.

9. In a-machine tool having a movable part, atransmission for moving said part at different.

speeds and including shirtablegears, a pressure nuidmotor for shifting said gears, a pressure fiuid-source,- apressure fluid circuit-from said source .to said-motorand having therein a set,- table, speed selector valve for controlling said motor and a time delay valve including a shiftable valve body havlng an area subject to fluid pressure to move the body in one direction and portions or different areas each smaller than said first area and proportional to a dilIerent speed of said part and selectively subject to fluid pressure to resist said movement, said circuit including means for conducting pressure fluid to said different areas, and means controlled by said motor for selecting the particular area of said different areas to which pressure fluid is to be applied to resist movement of said body in said one direction to provide the desired time delay.

10. In a machine tool having a movable part, a change speed transmission including shiftable gears for imparting a plurality of different speeds to said part,-a power source, a main clutch for connecting said source and transmission for working speed operation of the latter, means for connecting said power source and transmission for slow non-working speed operation of the latter preparatory to gear shifting, a pressure fluid motor for actuating said means, a pressure fluid motor for shifting said gears, and control means for said motors and including a pressure fluid source, a shiftable cycle control valve, a speed selector valve, a pressure fluid circuit from said source to said cycle control valve and thence to said selector valve and thence to said gear shifting motor, said circuit also extending from said cycle control valve to said non-working speed means motor, a time delay valve in said circuit between said cycle control valve and said selector valve and normally interrupting said circuit and having a piston area which when subjected to pressure fluid moves the body of said time delay valve in one direction to establish said circuit, said time delay valve body having a plurality of smaller pistons each'of difierent areas which when subject to pressure fluid resist'movement of 7 said body in said one direction to create a time delay, and a valve in said circuit and controlled by said gear shifting motor to selectively cause pressure fluid to be applied to one or another of said smaller pistons of the time delay 'valve body.

11. In a machine tool having a movable part, a change speed transmission for moving said part at different speeds and including shiftable gears, a power source, a clutch connecting said source and transmission for imparting to the latter a working speed, means for connecting said'transmission' to said power source for imparting to the latter a slow non-working speed preparatory to gear shifting, a pressure fluid motor for'actuating said means, a pressure fluid motor operatively associated with said shiftable gears for shifting the same, a pressure fluid source, acycle control valve connected to said pressure fluid source, a pressure fluid connection between said cycle control valve and said slow non-working'speed means motor, a speed selector valve, apressure fluid connection between said cycle control'valve'andsa'id selector valve andhaving'therein a time delay valve, a pressure fluid connection between said selector valve andsource, 'said' time delay'valve' having a shiftable valve'body provided with pistonportions of different pressure areas, fluid pressure connections ..20 r r between said piston portions and-said gearshift ing motor actuated valve with one of said connections always efiective for applying, pressure fluid to one of said piston portions to maintain said time delay valve body normally in a position to interrupt the circuit between the cycle control valve and the selector valve, said time delay valve having a main piston portion connected to the cycle control valvepby said second pressure fluid connection and subject to pressure fluid when said cycle control valve is shifted to initiate 'a gear shifting cycle, wherefore said time delay valve body will be moved from its normal position to establish communication between said cycle control valve and said selector valve with such movement opposed by the pressure fluid acting on one of said piston portions of different areas and which is related to one of the positions of the gear shifting motor.

12. In a machine tool as defined in claim 11 and wherein a pressure fluid motor is provided for actuating said clutch and there is a pressure fluid connection between said motor and said cycle control valve such that when said cycle control valve is shifted to initiate a gearshifting cycle said clutch is automatically disengaged to terminate the working speed drive of the transmission.

HARRY SCI-IOEPE.

REFERENCES CITED The following references are of record in the file of this patent: v,

UNITED STATES PATENTS Whitehead et al. Aug. 1, 1939 

